<?php $search_text = "cerca..."; ?> 
<form method="get" id="searchform"  
action="<?php bloginfo('home'); ?>/risultato-ricerca/"> 
<input type="text" value="<?php echo $search_text; ?>"  
name="s" id="s"  
onblur="if (this.value == '')  
{this.value = '<?php echo $search_text; ?>';}"  
onfocus="if (this.value == '<?php echo $search_text; ?>')  
{this.value = '';}" /> 
<input type="hidden" id="searchsubmit" /> 
</form>
<!--
<form id="searchbox_012793609149363494046:hy_d1i10yoe" action="<?php bloginfo('home'); ?>/risultato-ricerca/" onsubmit="return false;">
  <input type="text" name="q" size="40"/>
  <input type="submit" value="Search"/>
</form>
<script type="text/javascript" src="http://www.google.com/coop/cse/brand?form=searchbox_012793609149363494046%3Ahy_d1i10yoe&lang=it"></script>
-->